US 12,274,870 B2
Optical configuration of a medicament reservoir of a drug delivery device
Michael Helmer, Frankfurt am Main (DE)
Assigned to Sanofi, Paris (FR)
Appl. No. 17/298,760
Filed by Sanofi, Paris (FR)
PCT Filed Dec. 17, 2019, PCT No. PCT/EP2019/085540
§ 371(c)(1), (2) Date Jun. 1, 2021,
PCT Pub. No. WO2020/127191, PCT Pub. Date Jun. 25, 2020.
Claims priority of application No. 18306737 (EP), filed on Dec. 19, 2018.
Prior Publication US 2022/0031956 A1, Feb. 3, 2022
Int. Cl. A61M 5/31 (2006.01); A61M 5/315 (2006.01)
CPC A61M 5/31568 (2013.01) [A61M 5/3129 (2013.01); A61M 2205/3306 (2013.01); A61M 2205/3379 (2013.01); A61M 2205/50 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A drug delivery device comprising:
a reservoir comprising a wall defining a proximal end and a distal end;
a stopper comprising an optically reflecting element, the stopper being configured to expel a portion of a medicament stored within the reservoir by moving within the reservoir in a direction from the distal end to the proximal end, such that a stopper position is indicative of an amount of the medicament within the reservoir;
a light emitting system being configured to emit a light signal perpendicular to a travelling direction of the stopper to allow the light signal to travel through one of a concave geometry or a convex geometry defined by a first portion of the wall of the reservoir towards the stopper from the proximal end of the reservoir; and
a light detection system being configured to detect a reflected light signal perpendicular to the travelling direction of the stopper, the reflected light signal provided by a reflection of at least a portion of the light signal on the optically reflecting element of the stopper, the reflected light signal travelling towards the proximal end of the reservoir, and through an other of the concave geometry or the convex geometry defined by a second portion of the wall of the reservoir and a light collector of the light detection system,
wherein the light collector is configured to direct the reflected light signal to a light detector of the light detection system that is configured to provide an electrical signal in response to detecting the reflected light signal.